Like Gesture Input, Voice Input allows you to act on the focus of your Gaze. However, the commands you can use with Voice Input are only limited by your imagination.

There are basic voice commands like "select," that let you pick a certain hologram in your world. But you can also define your own commands and actions. You can even come up with complex commands that work with Cortana. At this point, there's really no telling how detailed we can get with Voice Input, but it seems like the feature could be ridiculously deep.